Baron, Robert S., author
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Buku Teks
Johnson, David W., 1940-, author
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Buku Teks
Johnson, David W., 1940-, author
Allyn and Bacon, 2000
Buku Teks
Johnson, David W., 1940-, author
Pearson Education, 2006
Buku Teks
Fisher, B. Aubrey, 1937-, author
McGraw-Hill, 1980
Buku Teks